While at the University of California, Seddon was a member of Sigma Kappa sorority.
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It was on this mission that Dr. Seddon took the badge of her sorority Sigma Kappa into space.
Sigma Chi | Sigma Xi | Sigma Alpha Epsilon | Kappa Alpha Psi | Delta Sigma Theta | Phi Kappa Phi | Phi Kappa Psi | Pi Kappa Alpha | Phi Kappa Theta | Kappa Kappa Psi | Delta Kappa Epsilon | Phi Beta Sigma | Sigma Corporation | Sigma Alpha Mu | Kappa Alpha Theta | Alpha Kappa Alpha | Sigma Phi Epsilon | Sigma | Kappa Sigma | Kappa Delta Rho | Kappa Alpha Society | Beta Gamma Sigma | Tau Beta Sigma | Six Sigma | Sigma Alpha Iota | Phi Theta Kappa | Phi Sigma Kappa | Phi Beta Kappa Society | Kappa Alpha Order | Smurfit Kappa Group |
Eventually she was joined by four other women, and along with Elizabeth Gorham Hoag, Ida Fuller, Frances Elliott Mann Hall and Coburn, Low created Sigma Kappa sorority at Colby on November 9, 1874.
Phi Sigma Epsilon (ΦΣΕ) Men's Social Fraternity, which merged into Phi Sigma Kappa in 1985